/*

 * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package java.nio.channels;

import java.io.IOException;

import java.nio.ByteBuffer;

/**

 * A channel that can write bytes.

 *

 * <p> Only one write operation upon a writable channel may be in progress at

 * any given time.  If one thread initiates a write operation upon a channel

 * then any other thread that attempts to initiate another write operation will

 * block until the first operation is complete.  Whether or not other kinds of

 * I/O operations may proceed concurrently with a write operation depends upon

 * the type of the channel. </p>

 *

 *

 * @author Mark Reinhold

 * @author JSR-51 Expert Group

 * @since 1.4

 */

public interface WritableByteChannel

    extends Channel

{

    /**

     * Writes a sequence of bytes to this channel from the given buffer.

     *

     * <p> An attempt is made to write up to <i>r</i> bytes to the channel,

     * where <i>r</i> is the number of bytes remaining in the buffer, that is,

     * <tt>src.remaining()</tt>, at the moment this method is invoked.

     *

     * <p> Suppose that a byte sequence of length <i>n</i> is written, where

     * <tt>0</tt>&nbsp;<tt>&lt;=</tt>&nbsp;<i>n</i>&nbsp;<tt>&lt;=</tt>&nbsp;<i>r</i>.

     * This byte sequence will be transferred from the buffer starting at index

     * <i>p</i>, where <i>p</i> is the buffer's position at the moment this

     * method is invoked; the index of the last byte written will be

     * <i>p</i>&nbsp;<tt>+</tt>&nbsp;<i>n</i>&nbsp;<tt>-</tt>&nbsp;<tt>1</tt>.

     * Upon return the buffer's position will be equal to

     * <i>p</i>&nbsp;<tt>+</tt>&nbsp;<i>n</i>; its limit will not have changed.

     *

     * <p> Unless otherwise specified, a write operation will return only after

     * writing all of the <i>r</i> requested bytes.  Some types of channels,

     * depending upon their state, may write only some of the bytes or possibly

     * none at all.  A socket channel in non-blocking mode, for example, cannot

     * write any more bytes than are free in the socket's output buffer.

     *

     * <p> This method may be invoked at any time.  If another thread has

     * already initiated a write operation upon this channel, however, then an

     * invocation of this method will block until the first operation is

     * complete. </p>

     *

     * @param  src

     *         The buffer from which bytes are to be retrieved

     *

     * @return The number of bytes written, possibly zero

     *

     * @throws  NonWritableChannelException

     *          If this channel was not opened for writing

     *

     * @throws  ClosedChannelException

     *          If this channel is closed

     *

     * @throws  AsynchronousCloseException

     *          If another thread closes this channel

     *          while the write operation is in progress

     *

     * @throws  ClosedByInterruptException

     *          If another thread interrupts the current thread

     *          while the write operation is in progress, thereby

     *          closing the channel and setting the current thread's

     *          interrupt status

     *

     * @throws  IOException

     *          If some other I/O error occurs

     */

    public int write(ByteBuffer src) throws IOException;

}